A.D. 2999 - A freak accident aboard the starship TA-29 results in ace pilot Yamamoto Yohko losing her memory. She returns to the year 1999 to live her life as a normal high school girl, but she slowly receives recurring flashbacks of her space battles. When she is finally reunited with the TERRA team and the TA-29, she quickly regains her memory and returns to her winning ways as the Starship Girl Yamamoto Yohko.